Dating to the 3rd millennium BC, these atmospheric ruins in Tyre, Lebanon cover a large area leading down to an ancient submerged harbour. Highlights include a street paved with geometrical Roman and Byzantine mosaics, on each side of which are rows of large columns. Look out also for the unusually large public Roman bathhouse from the 2nd or 3rd century AD and a 4th-century rectangular arena that would have held up to 2000 spectators, perhaps to watch some sort of ancient water sport.
Source: https://www.lonelyplanet.com/lebanon/tyre/attractions/al-mina-archaeological-site/a/poi-sig/1459371/361105
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